mirror of
https://github.com/NixOS/nix.git
synced 2024-11-22 06:42:28 +00:00
c6a89c1a16
While preparing PRs like #9753, I've had to change error messages in dozens of code paths. It would be nice if instead of EvalError("expected 'boolean' but found '%1%'", showType(v)) we could write TypeError(v, "boolean") or similar. Then, changing the error message could be a mechanical refactor with the compiler pointing out places the constructor needs to be changed, rather than the error-prone process of grepping through the codebase. Structured errors would also help prevent the "same" error from having multiple slightly different messages, and could be a first step towards error codes / an error index. This PR reworks the exception infrastructure in `libexpr` to support exception types with different constructor signatures than `BaseError`. Actually refactoring the exceptions to use structured data will come in a future PR (this one is big enough already, as it has to touch every exception in `libexpr`). The core design is in `eval-error.hh`. Generally, errors like this: state.error("'%s' is not a string", getAttrPathStr()) .debugThrow<TypeError>() are transformed like this: state.error<TypeError>("'%s' is not a string", getAttrPathStr()) .debugThrow() The type annotation has moved from `ErrorBuilder::debugThrow` to `EvalState::error`.
15 lines
411 B
Plaintext
15 lines
411 B
Plaintext
error:
|
|
… while evaluating an attribute name
|
|
at /pwd/lang/eval-fail-using-set-as-attr-name.nix:5:10:
|
|
4| in
|
|
5| attr.${key}
|
|
| ^
|
|
6|
|
|
|
|
error: expected a string but found a set: { }
|
|
at /pwd/lang/eval-fail-using-set-as-attr-name.nix:5:10:
|
|
4| in
|
|
5| attr.${key}
|
|
| ^
|
|
6|
|